need help accessing wrt54g firmware

I need some help! I just moved into a new apartment. Every room has an ethernet port, and I ran Linksys's automatic setup utlility to get the internet working since I could not do it myself. I have my computer plugged into port #1 on the computer. Everything works perfectly, including the internet and printer sharing, but I would like to enable some type of security. The BIG problem is I can not get into the router's firmware like I have always been able to do through 192.168.1.1 Internet Explorer just stalls when I try to access it. I also tried using firefox and netscape browsers to access my firmware, and it still won't work. I do have windows firewall enabled, but other than that, no other firewalls. Any suggestions anyone? I would appreciate anyone's help. Thanks.
-Pete

I found out what the problem is. I do not understand why it did this, but instead of using 192.168.1.1 to access the router, it has now changed to 192.168.1.100 (all I had to do was add two zero's at the end). Really weird, but hey, atleast it works now! Thanks,